Lexmark W820 Service Manual page 266

Removal
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5.
WARNING: Do not remove Printhead covers or disassemble the Printhead Assembly.
There are no replaceable parts or field adjustable points located inside the Printhead
Assembly.
Replacement
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Service Manual
Remove the Low Voltage Power Supply.
Disconnect J106, J207, J407, and J430 from the Printhead.
Remove the three screws that secure the Printhead to the printer frame.
Lift the Printhead Assembly off of the printer frame.
Place the Printhead Assembly on a flat and stable surface.
Reinstall the Printhead Assembly onto the printer frame. The small PWB mounted
on the side of the Printhead Assembly should be near the HVPS and MCU side of
the printer frame.
Reposition the Printhead Assembly until the two locating pins mounted on the
bottom of the Printhead drop into locating holes that are cut into the printer frame.
Make sure you have not trapped any wire harnesses under the Printhead Assembly.
Use three screws to secure the Printhead Assembly to the printer frame.
Reconnect J106, J207, J407, and J430 to the Printhead.
Reinstall the LVPS.
4025-XXX